Constantly wet down there (abnormal discharge?)

I'm in high school and the majority of my cycle I am constantly wet but it's worst right before my period for about a week. I'm not sure if it counts as discharge or what.. it's usually clear and has a bit of a smell or none at all, but I feel it all day and it grosses me out. It comes to the point where I have to wear a tampon to keep my vagina from literally making a moist mark on my seat.. it's so embarrassing. And this entire week it's smelled awful and I couldnt get rid of the smell no matter how often I showered it was disguisting. Pls help! Any advice or info is greatly appreciated, I don't know of anyone else who has this issue.